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GCN Circular 35437

Subject

GRB 231230A: Prompt enhanced Swift-XRT position

Date

2023-12-30T02:04:59Z (a year ago)

From

Phil Evans at U of Leicester <pae9@star.le.ac.uk>

Via

P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:

Using  promptly downlinked XRT event data for GRB 231230A, we find an
enhanced XRT position of the afterglow: RA, Dec: 245.21382, 58.12618
which is equivalent to:
   RA (J2000)  = 16 20 51.32
   Dec (J2000) = +58 07 34.2
with an uncertainty of 1.9 arcseconds (radius, 90% confidence).
Analysis of the promptly available data is online at
http://www.swift.ac.uk/sper/1205319.

Position enhancement is is described by Goad et al. (2007, A&A, 476,
1401) and Evans et al. (2009, MNRAS, 397, 1177).

This circular is an official product of the Swift-XRT team.